1. Adding Items to your Amazon.com Shopping Cart does not require you to be currently signed in to Amazon.com - however you must sign in with a valid account in order to complete your purchase.2. Adding Items to your Amazon.com Wishlistdoes require you to sign in to Amazon.com. If you are not currently signed in, you may be prompted to sign in - then the items will be automatically added to your Wishlist. One small bug on Amazon's part - if you have an item with a quantity higher than 1, you may see a false message on Amazon's site saying "Thanks for adding this item with a quantity of 1". When you click through to your actual Wishlist, you will see the proper quantity reflected there.3. Adding Items to your Amazon.com Wedding Registry requires that you be signed in and either have an existing Wedding Registry, or take a few steps to create one. Once you have signed in or created one, items will be automatically added to your Wedding Registry.4. Adding Items to your Amazon.com Baby Registry requires that you be signed in and have an existing Baby Registry. You have to take a few steps to create one, then once you have created one and signed in, return to this page and items can be added to your Baby Registry.